Flew back from Charleroi to Edinburgh with Ryanair, it was €6 for "Priority Boarding" which allows you to take a 55x40x20 cm bag into the cabin plus a small handbag sized one which must fit under the seat.
I've put "Priority Boarding" in quotes because about two thirds of the passengers on the (full) flight had it meaning that the "Priority " queue was about twice as long as the standard boarding!